Transformer oil is not only an insulating medium, but also plays a cooling role. However, the high moisture content in transformer oil will have a serious impact on the performance of the transformer, so it is particularly important to test the micro water in transformer oil.
Transformer oil is mainly used to provide electrical insulation and heat conduction. Its chemical stability and electrical insulation properties make it an important part of transformers. With the extension of the use time, the transformer oil may accumulate moisture, gas and impurities, which will affect the normal operation of the transformer.
Second, the influence of water on the transformer
1. Reduced insulation performance: The presence of moisture will lead to a reduction in the insulation strength of transformer oil, increasing the risk of breakdown. The deterioration of insulation performance can lead to equipment failure and even power accidents.
2. Corrosion and aging: the reaction of water with the chemical composition of the transformer oil will lead to the oxidation and deterioration of the oil, increasing the risk of corrosion of the metal parts inside the transformer and shortening the service life of the equipment.
3. Reduced heat conduction efficiency: The presence of water will affect the heat conduction performance of the transformer oil, resulting in overheating of the equipment and affecting its normal operation.
In order to ensure the safe operation of the transformer, it is necessary to regularly test the micro-water in the transformer oil. Here are some common test methods:
1. Karl Fischer Titration: This is one of the most commonly used testing methods to determine precisely the amount of water in an oil. This method calculates the amount of water by converting it into a measurable substance through a chemical reaction.
2. Infrared spectroscopy: The use of infrared spectroscopy analysis technology can detect the content of moisture in transformer oil. This method has the advantages of fast and non-destructive, but it needs professional equipment and technical support.
3. Resistance method: Calculate the moisture content by measuring the resistance change of transformer oil. Although the method is relatively simple, it has low accuracy and is suitable for preliminary screening.
4. Moisture meter: There are special moisture meters on the market that can directly measure the moisture content in transformer oil, and this equipment is usually convenient to use and suitable for rapid on-site detection.
Frequency of micro-water test The frequency of micro-water test usually depends on the operating environment, service life and load of the transformer. For transformers operating under high loads and harsh environments, it is recommended to conduct a comprehensive moisture test every year. For normal operation of the transformer, it can be carried out every two to three years.
Analysis of test results Analysis of test results is crucial for judging the health of the transformer. In general, the moisture content in transformer oil should be controlled within a certain range, usually not more than 50 ppm (one part per million). If the test results show that the moisture content exceeds this standard, corresponding measures must be taken, such as replacing the oil or oil treatment, to ensure the normal operation of the transformer.
Micro-water test in transformer oil is an important step to ensure the safety of power system. Through regular testing and analysis, potential problems can be found in time, equipment failures can be prevented, and the service life of the transformer can be extended. With the progress of technology, the methods of micro-water testing are also constantly updated, and there will be more efficient and accurate detection means in the future, providing a stronger guarantee for the safe operation of the power industry.